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Share Capital - Summary of Non-Vested Options (Detail) | 12 Months Ended
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Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of share subject to options, Granted | 1,112,779 | 1,229,689
Weighted average grant date fair value, Granted | $ 5.73 | $ 5.03
Non-vested options [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share options, beginning of the year | 2,139,320 |
Number of share subject to options, Granted | 1,112,779 |
Number of share subject to options, Vested | (1,000,441) |
Number of share subject to options, Forfeited | (172,505) |
Share options, end of the year | 2,079,153 | 2,139,320
Weighted average grant date fair value, Granted | $ 5.73 |
Weighted average grant date fair value, Vested | 5.24 |
Weighted average grant date fair value, Forfeited | 5.40 |
Weighted average grant date fair value, Non-vested share options | $ 5.53 | $ 5.28

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- Definition The number of share options forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_iii&doctype=Standard -URIDate 2018-03-16 + Details
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